test_obj_no_differences fail

I again observed a test fail during packaging for Tumbleweed:

================================================================================================================== FAILURES ==================================================================================================================
__________________________________________________________________________________________________________ test_obj_no_differences ___________________________________________________________________________________________________________

obj1 = <<class 'abc.MachoFile'> /home/abuild/rpmbuild/BUILD/diffoscope-178/tests/data/test1.macho>

    def test_obj_no_differences(obj1):
        difference = obj1.compare(obj1)
>       assert difference is None
E       assert <Difference /home/abuild/rpmbuild/BUILD/diffoscope-178/tests/data/test1.macho -- /home/abuild/rpmbuild/BUILD/diffoscop.../BUILD/diffoscope-178/tests/data/test1.macho -- /home/abuild/rpmbuild/BUILD/diffoscope-178/tests/data/test1.macho []>]> is None

tests/comparators/test_macho.py:49: AssertionError

With diffoscope 178. I don't know how I can investigate this one better.